Services running at reduced speeds include trains between London and Brighton, coastal services in Hampshire, including the Petersfield to Portsmouth and Weymouth routes, as well as coastal routes in Sussex and some coastal routes in Kent.

But Network Rail warned the plans are subject to change and adjustments could come at short notice as Storm Brian develops.

"People living near the railway can help by ensuring garden furniture, equipment and trampolines are secure", said Network Rail in a statement.

Meanwhile, the rail operator has advised passengers to plan their journey in advance and allow extra time for travel.